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viruszika
@viruszika
July 2021
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Упростить выражение:
а) -tgа x ctga + cos^2a
б) sin^2a/1-cos^2a
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Ртуть3
A)-tg(а)*ctg(a) + cos^2(a) = - (tgа*ctga) + cos^2 a = -1+cos^2 (a)=-1+(1-sin^2 (a))= -1+1-sin^2 (a)=-sin^2 (a)
б) sin^2(a)/(1-cos^2(a)) =
sin^2(a)/(sin^2(a)) = 1
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Answers & Comments
б) sin^2(a)/(1-cos^2(a)) = sin^2(a)/(sin^2(a)) = 1